Table of contents

1. Introduction to Biochemistry4h 34m
2. Water3h 23m
3. Amino Acids8h 10m
4. Protein Structure10h 4m
5. Protein Techniques14h 5m
6. Enzymes and Enzyme Kinetics13h 38m
7. Enzyme Inhibition and Regulation 8h 42m
8. Protein Function 9h 41m
9. Carbohydrates7h 49m
10. Lipids5h 49m
11. Biological Membranes and Transport 6h 37m
12. Biosignaling9h 45m
Review 1: Nucleic Acids, Lipids, & Membranes2h 47m
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m
Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

4. Protein Structure

Peptide Bond

Biochemistry

4. Protein Structure

Peptide Bond

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Multiple Choice

In a polypeptide, where are the peptide bonds located?

Between the N-terminus and the C-terminus of the entire polypeptide

Between the side chains (R groups) of adjacent amino acids

Between the phosphate groups and sugars

Between the carboxyl group of one amino acid and the amino group of the next amino acid

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Verified step by step guidance

Understand the structure of a polypeptide: A polypeptide is a chain of amino acids linked together by peptide bonds. Each amino acid has a central carbon atom (α-carbon) bonded to an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom, and a unique side chain (R group).

Identify the functional groups involved in peptide bond formation: Peptide bonds are formed between the carboxyl group (-COOH) of one amino acid and the amino group (-NH2) of the next amino acid. This reaction is a condensation reaction, meaning a molecule of water (H2O) is released during bond formation.

Clarify the location of peptide bonds: Peptide bonds are located specifically between the carboxyl group of one amino acid and the amino group of the adjacent amino acid in the polypeptide chain. They do not form between the side chains (R groups) or between the N-terminus and C-terminus of the entire polypeptide.

Explain why the other options are incorrect: Peptide bonds do not form between the side chains (R groups) of amino acids, as these groups are not involved in the primary structure of the polypeptide. Similarly, peptide bonds are not related to phosphate groups and sugars, which are components of nucleotides in DNA and RNA, not polypeptides.

Summarize the correct answer: The peptide bonds in a polypeptide are located between the carboxyl group of one amino acid and the amino group of the next amino acid, forming the backbone of the polypeptide chain.